SYNTHESIS OF MULTICOMPONENT HEAT-SHIELDING RADIATION-RESISTANT CERAMICS WITH VARIATION OF STOICHIOMETRY OF CERAMIC COMPONENTS

The paper presents the results of obtaining multicomponent heat-protective radiation-resistant ceramic materials based on the WO₃–Bi₂O₃–ZnO–TeO₂–CeO₂–ZrO₂ compounds obtained by mechanochemical solid-phase synthesis with further annealing at a temperature of 1000 °C. The introduction of doping substances into the structure in the form of metal oxides makes it possible to prevent undesirable structural changes in ceramics and improve the durability and stability of the system. The choice of the synthesis of ceramics based on zirconium oxide is associated with the presence of several valuable physical and mechanical properties of the substance, and, as a consequence, the possibility of application in the field of functional materials for use in a variety of technical fields. The processes of phase formation in multicomponent ceramics based on oxide refractory compounds (WO₃, Bi₂O₃, ZnO, TeO₂, CeO₂, ZrO₂) were studied by scanning electron microscopy, energy dispersive and x-ray phase analysis methods. Using a combination of the presented methods, the following results were obtained, which make it possible to comprehensively characterize the samples under study, as well as establish the dependence of the influence of variations in the oxides used on the phase composition and morphological features of the ceramics. Analysis of morphological parameters showed that with increasing dopant concentration, a denser structure of agglomerates is formed, which is associated with sintering of particles at higher dopant concentrations. According to the obtained results of energy dispersive analysis, it was found that the addition of ZrO₂ results a slight redistribution of elements in the structure, so the atomic content of Ce, W, Bi, and Te decreased by 2.58; 3.38; 2.12; 1.91 times, respectively, and the atomic content of Zn increased by 1.32 times. Analysis of diffraction patterns showed that the studied samples WO₃-Bi₂O₃-ZnO-TeO₂-CeO₂-ZrO₂ are characterized by the content of Zn₃(TeO₆), ZnTeO₃, CeO₂, Bi₂O₃, Bi₂WO₆, ZnWO₄, Ce₅Zr₃O₁₆, ZnO, (Zr_0.98Ce_0.02)O₂ phases.

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